Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cf4831aacc4f3d…

MALICIOUS

PDF

93.5 KB Created: 2021-06-10 03:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: cc2cc0d6cf5669162bfacd77f3659b0f SHA-1: bb935094955e641124be7f5f22d8f11046e9070a SHA-256: b5cf4831aacc4f3d0cbaa9147b22cdd072ba74d17277f07fb063576161c9d6ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://nomylo.ru/uplcv?utm_term=combine+multiple+jpegs+into+one+pdf+windows PDF link annotation
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/63c9a891671b5b80a86d21fbabae207b/rabizoputumofiwosemimov.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/966a569ba7350d6ac533ecb28d7ba1ad/juvikakipaguzidoziwo.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/a77f2537d16bf10d0a059d0655b173ac/tutovexisofifuwerejuxilit.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/qmd2mh9g1b1ll60ilu3g2m19te/nabot.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/tiwebobasep.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e965eb12e6---25734902500.pdfIn PDF document text
    • http://goref.ru/files/file/gevepojaxatidisugevub.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/4vor04adl1b72kdiqos601ovpp/fagarezikitoruwuluzil.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076fa35a5f55---widogobefufaxidoz.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/d4074ac93229cbe6571a9bb6812d1345/68887491099.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0c4871ba50724489c1193dd8221454b3/jujagekubogesirovufe.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-3/20210503110611674453.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/parogipilafuje.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/95072110197.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/mowepuxonat.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED83 6568 bytes
SHA-256: 611f3db65d644b1c54ca9459fd1b922419f4f90529f892feeb7d4571f542e8e8
font_01_sfnt_off0000fdd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD2 5268 bytes
SHA-256: 480c8fedd88261569223544dc1adbd23f989d3b5be009bd536db9c86593927f0
font_02_sfnt_off00010fb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FB7 3372 bytes
SHA-256: 5746db2912e8a25a7d2c106346c1c3a00520575b272543a73fb1cf1a8c059f5f
font_03_sfnt_off00011dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DBA 10884 bytes
SHA-256: 1d6933667162f13c6af0cdd9351e81dbdbfaca234e616fa02efdd81581995682
font_04_sfnt_off000142eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142EB 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1
font_05_sfnt_off00015753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15753 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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